AL-DON Indoor Air Quality Specialists
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About AL-DON Indoor Air Quality Specialists
AL-DON Indoor Air Quality Specialists has kept St. Louis families comfortable for 67 years, earning a 4.7-star rating across 104 reviews. This second-generation, family-run business traces its roots to founders Al Kuennen, Don Herkenhof, and Jane Miller, with current owners Jeff and Toi carrying forward a legacy of technical excellence and genuine care for customers. Operating Monday through Friday from 8 AM to 4:30 PM, AL-DON serves St. Louis, Town and Country, and surrounding Greater St. Louis communities. All technicians are NATE-certified and bonded, and the company holds an A+ rating with the Better Business Bureau, along with memberships in the Air Conditioning Contractors of America and the Indoor Air Quality Association.
What sets AL-DON apart is their specialization in indoor air quality, a focus that goes beyond typical HVAC service. Their offerings include air quality testing, high-efficiency filters, electrostatic filters, UV duct purifiers, whole-home humidifiers and dehumidifiers, and dryer vent cleaning. They partner with trusted brands including Daikin, Amana, Armstrong Air, and Rheem. The company also provides emergency HVAC services for urgent situations, along with financing options and a Maintenance Value Plan for ongoing system care. This combination of specialized air quality expertise and practical homeowner support distinguishes them from standard heating and cooling contractors.
Reviewers consistently praise specific technicians who deliver exceptional service. Hector resolved a friend's AC issue within hours, earning a "knowledgeable" and "exceptional" commendation. Boyan performed semi-annual maintenance while thoroughly explaining system components to homeowners, a pattern noted across multiple five-star reviews. Steve Harbison has relied on AL-DON for seasonal AC checks over several years, calling Hector "one in a million" and noting the crew has serviced his parents' furnace since the 1980s. These named customer experiences reflect a team that arrives prepared, works until the job is done right, and treats every interaction with care.
What Customers Say
Five of six reviewers award five stars, with technicians Hector and Boyan named specifically for their knowledge, professionalism, and clear communication. The single two-star review cites a customer service issue unrelated to technical work. Multiple reviewers note 15+ year customer relationships, and emergency and same-day service appears to be available.
Working Hours
| SundayToday | Closed |
| Monday | 8 AM–4:30 PM |
| Tuesday | 8 AM–4:30 PM |
| Wednesday | 8 AM–4:30 PM |
| Thursday | 8 AM–4:30 PM |
| Friday | 8 AM–4:30 PM |
| Saturday | Closed |
Services
AC Repair & Replacement
Central air and ductless mini-split repair, replacement, and new installation services for all brands and system ages.
Heating Services
Furnace repair and replacement, boiler services, heat pump maintenance, and radiant floor heating support.
Indoor Air Quality Testing
Professional testing to identify pollutants, allergens, and contaminants affecting home air quality.
Ductwork Services
Duct cleaning, repair, and installation to improve airflow and reduce contaminant circulation.
High-Efficiency Filtration
Installation of high-efficiency filters, electrostatic filters, and whole-home air scrubbers.
Whole-Home Humidity Control
Whole-home humidifiers and dehumidifiers to maintain optimal indoor humidity levels year-round.
Dryer Vent Cleaning
Professional dryer vent cleaning to improve dryer efficiency and reduce fire hazards.